Create Pixel Art

I'm making a Javascript game, and I need different kinds of sprites for different things, namely: objects, buildings and possibly characters as well. I need small items such as weapons, tools, armour, rings, shields stuff like that. For these I'm thinking 32x32 pixels for each item. The buildings though need to be a little bit bigger in size, lets say 128x128 pixels in a style similar to this: [login to view URL] And for the characters, it's less like preset characters but more like pieces of characters heads that I can use to randomly generate different faces. So for example, different head shapes, skin colours, eye shapes, hair shapes, mouth shapes, stuff like this, so each face would be built randomly from these assets. Maybe overall completed head would be 64x64 pixels, but of course the individual pieces would vary in size. Is any of this something you would like to do or do you have any questions? Thank you :)