I want to share a small trick I use to improve my imagination and my knowledges in Art.
First, imagination need to be feeded. More you can watch new things, more you can mix and create new ideas. Also I try to not follow other artist in the same category as me. I prefer be inspired by 2D designer, industrial designer, photographer, architect, and so. Because a diverse source of inspiration is one of the key point for new ideas.
I'm connected to these RSS which are actively searching some new stuff.
I use Bloglines.com for agregate them.
Firefox and "Save Image in Folder" plugin to save and organize.
Here they are ! Hundreds of interesting images, illustrations, design, architecture and so... by weeks.