Designer's Block

There are things I'm good at designing and thinking about, and things I'm not. Some of these things are consistent while others fluctuate. I can almost always come up with a new way to do a magic system. Actually sitting down and building spell lists though, that's when I get bogged down. Right now progress on Renaissance has crawled to a stop because the remaining tasks are either time intensive (reading the whole of the book, building an index, etc.) and I don't have time for that, or because I have designer's block. It's just what it sounds like. It's like writer's block, only for designing. I need to create lists of Divine Powers (clerical spells, basically) for about 8 or 9 deities still and I'm just stuck. Perhaps some of the tricks for resolving writer's block will work here too.