cuboids

Hello, I am already planning to make basic 3x3x3 mods. I have a Dremel, Milliput, etc. My big question to you all, is how to make cuboids? I have seen Ian C's videos on the matter, but I am still utterly befuddled as to how to build the following cuboids. Please could someone reply with...

Hi im Scott, and im interested in creating and modifying cubes to become cooler and better Know would you guys buy cubes like these 2x3x3 10$+shipping Corner Bandaged 5x5 12$+shipping 2x4x4 15$ 3x5x5 20$ 4x6x6 30$ 5x7x7 45$ ETC. Please tell me what you think these cubes will be fairly cheap!:tu