If I'm not feeling too much like sculpting, or modelling... or just not feeling the motivation, which happens a lot to me. I find browsing ZbrushCentral and seeing all the top row work there usually gets me motivated.

Everybody has their 'ZBCentral' somewhere. Where the best of the best post their work, and you can feel nothing but respect and a lot of jealousy towards their work... but most of all you feel motivation to create art at that level!

Gets me motivated anyway