Zombie could be interesting, especially if it's done well. Maracite could be gorgeous, though if they'll do another Maracite pet so soon is debatable. Woodland and Transparent could also be very interesting for this pet. Maraquan could be interesting (or, at least, very unusual). Chocolate, Jelly, or even a very well-done Strawberry could be amusing. Ice and Snow are somewhat seasonal but tend to be hit or miss in terms of how well they are done - especially Ice. Camouflage and Electric usually depend on artist for their appeal or lack thereof (and there's been that poor unreleased camouflage Lenny for ages). Gold and Silver are usually shiny colourfills. Biscuit could be interesting if done right. Sponge and Grey have lost a lot since the revamp. Custard and Glowing are Custard and Glowing.
Thoughts, hopes, desires?
Faster than a speeding cheeseburger, but not by much.
I picked Woodland (the Lenny's shape really lends itself to being converted into a tree), and Electric (cause we haven't had one for ages). Zombie could look awesome. Other possibles for prettiness are Transparent and Maractite (though the latter is unlikely after the glut we've had recently).
I'm always hoping for Maraquan, I'd like to see how they would handle it! I figure they will end up doing Camo no matter what major color is done, as it's a pretty simple color fill.