I may have a cheap (cost £11) 100MM filter holder you can have. I think it came with a 77mm adapter ring. It's not great, in fact it's terrible, but if I can find it, it'll be free. I was going to give it to someone else, but I can't remember if I ever did.
That, coupled with some £18 KOOD filters would be a good start, to see if you like it. (Imho)