Well stick with a few patterns that are easy to tie and are effective!
Much like reloading, I've never really found tying much of a cost savings, especially with some of the discount places on the web but it is a lot of fun. Like you I tend to tie the same patterns in the winter and just occasionally deviate. Most are in size 16/18/20
Pheasant tails (have shot enough to have a long-time supply of tails)
Hares ears
Copper Johns
Small stoneflies
Elk Hair Caddis
Adams
Ants