You can make several different types of maki sushi quite easily. (maki sushi is the traditional rolled up kind with seaweed outside, rice inside, and a "filling") You needn't always use fish either... there are a lot of really good vegetarian maki sushi recipes as well as recipes that use cooked fish.
Might I suggest to you:
California maki- avocado, crab, mayonnaise.
Oshinko maki- japanese pickled daikon (soooo yummy!)
Kappa maki- cucumber
Here is a site with more suggestions and recipe for sushi maki:
Here is a good website on basic your sushi rolling technique: http://www.mediterrasian.com/cuisine_of_month_sushi.htm
And a website with TONS of links:
Hope that helps!!!
Sushi making is fun and rewarding. It can be time consuming, but the effort is well worth it.