The Cube Snap Dude suggests buying these cubes (from Amazon)
These will work well right out of the box with Cube Snap (no color customizations needed).
2x2x2
Rubik's 2 x 2 Cube
D-FantiX speed cube 2x2- turns nice - most recommended
3x3x3
Rubik's Cube 3x3 - Official
D-FantiX speed cube 3x3 - turns nice - most recommended
4x4x4
Rubik's Cube 4x4 - Official
D-FantiX speed cube 4x4 - turns nice - most recommended
5x5x5
Rubik's Cube 5x5 - Official
D-FantiX speed cube 5x5 - turns nice - most recommended
Pyraminx
Pyraminx (Dreampark) Speed Cube
Mirror
Mirror Cube w/Color - This looks cool with patterns and you can use the 3x3 solver to enter (recommended)
ShengShou 3 x 3 Gold Mirror Cube Puzzle
Skewb
ShengShou Skewb Puzzle Speed Cube White
Void
The Void Puzzle