I've seen adoption fundraisers do can/bottle drives, sell things (shirts, hats, jewelry) from or representing the country they are adopting from (bracelets with little charms of African countries, a tshirt with the shape of Africa embroidered on the bottom). I've seen bake sales, car washed, etc.
I follow a couple of pages on Facebook created by couples adopting internationally, and support their efforts. I also hope to adopt internationally one day.
Oh, and gofundme.com is a definite must!