Really it's totally up to you. I've seen posts where people spent a lot or a little or made things that obviously took a LOT of time (and sometimes money). It's honestly the thought that counts and the fun in finding new goodies in your Fish Extender. If you don't have a lot of money to put into it, so long as you put Thought into it, you're all good. There are threads on here with pictures of the things people have done to give you some awesome ideas!!