Rogues Memorabilia
This 2013 book lists all the hero and villain pets in the DC Super-Pets universe.  Many appear in the Super-Pets series of books, but I don’t think all of them do — for instance, Captains Cold and Boomerang and their pets have entries in this encyclopedia, but as far as I know they haven’t yet appeared in any books.  Professor Zoom and his newts appear in their own book, however, as do Gorilla Grodd and his pet monkey.
The art is absolutely fun and adorable, and the creators clearly had fun inventing all these pets.  It’s very kid-friendly and overall quite cute, and still readily available for sale.
(You can see the entries for the Rogues and their pets here.)

This 2013 book lists all the hero and villain pets in the DC Super-Pets universe.  Many appear in the Super-Pets series of books, but I don’t think all of them do — for instance, Captains Cold and Boomerang and their pets have entries in this encyclopedia, but as far as I know they haven’t yet appeared in any books.  Professor Zoom and his newts appear in their own book, however, as do Gorilla Grodd and his pet monkey.

The art is absolutely fun and adorable, and the creators clearly had fun inventing all these pets.  It’s very kid-friendly and overall quite cute, and still readily available for sale.

(You can see the entries for the Rogues and their pets here.)

This casino-style slots game, titled The Flash: Velocity, can be played at various gambling sites online.  It’s not strictly memorabilia, but games fall under the umbrella of Rogue-related merchandise.

This officially-licenced Super Friends shirt was made by Trunk Ltd in about 2011.  It’s deliberately distressed (faded) to give it a vintage look.

This 2013 book is different from the other Capstone DC books I’ve seen; the book is longer and clearly aimed at a slightly older audience (though it’s still for children).  The story is about Batman going undercover as Matches Malone to investigate a supervillain convention.  Though the Batvillains are naturally the most prominent, the Rogues are in it a fair bit.
The book is mostly text, with some illustrations.  You can see one of the art pages here.

This 2013 book is different from the other Capstone DC books I’ve seen; the book is longer and clearly aimed at a slightly older audience (though it’s still for children).  The story is about Batman going undercover as Matches Malone to investigate a supervillain convention.  Though the Batvillains are naturally the most prominent, the Rogues are in it a fair bit.

The book is mostly text, with some illustrations.  You can see one of the art pages here.

This dual-sided licenced shirt (showing the front and back) came out in 2012.  It features Alex Ross’ villains art from the Justice series.  It was formerly sold at Hot Topic, but now appears to be out of stock.

There’s another black shirt for sale these days with the same front, but it doesn’t seem to have an image on the back (and if so, Cold isn’t on it).  So be careful if you buy online.

Made by Graphitti, this officially-licenced t-shirt is from about 2012.  The art is taken from the cover of Superman/Batman #63 (by Rafael Albuquerque), though with Grodd’s name in place of the torn Superman and Batman emblems.

Made by Graphitti, this officially-licenced t-shirt is from about 2012.  The art is taken from the cover of Superman/Batman #63 (by Rafael Albuquerque), though with Grodd’s name in place of the torn Superman and Batman emblems.

From Junk Food, this officially licenced t-shirt was released in 2010.  Like a lot of superhero t-shirts these days, it’s purposely faded to give it a vintage look.  And it’s very difficult to find now, unfortunately.

The image is taken from the 1976 DC calendar.

Out in 2008, Gorilla Grodd was part of a Minimate two-pack with the Flash. He’s apparently slightly taller than most Minimates, which is appropriate.  
It’s a shame there haven’t been any other Minimate Flash villains (not even a repainted Reverse Flash, which is weird), because I love these little figures.

Out in 2008, Gorilla Grodd was part of a Minimate two-pack with the Flash. He’s apparently slightly taller than most Minimates, which is appropriate.  

It’s a shame there haven’t been any other Minimate Flash villains (not even a repainted Reverse Flash, which is weird), because I love these little figures.

Out in 2011, this is volume one of an RPG sourcebook.  It contains alphabetized biographies and gaming statistics for a variety of DC characters, including several Rogues (volume 2 has the remaining characters).  This volume has entries for Abra Kadabra to Heat Wave, though curiously there’s nothing for Dr Alchemy.
The books are published by the gaming company Green Ronin.

Out in 2011, this is volume one of an RPG sourcebook.  It contains alphabetized biographies and gaming statistics for a variety of DC characters, including several Rogues (volume 2 has the remaining characters).  This volume has entries for Abra Kadabra to Heat Wave, though curiously there’s nothing for Dr Alchemy.

The books are published by the gaming company Green Ronin.

Cards from series I of the DC Cosmic Cards set, released in 1992 by Impel.  

The ‘Great Battles’ cards depict interpretations of classic comics storylines (for instance, the three cards with Dr Alchemy are re-creating scenes from Justice League of America v1 #21-22, and the Millennium card shows Suicide Squad’s involvement in the crossover).