Love my SIL!

I'm just feelin lucky to have such a great SIL. She has done soooo much for my wedding so far. She made our save the dates, our invitations, my shower invitations, and took charge of planning the shower and bacherlorette party, she just is always helping me it seems. FH's Aunt got the invite today and said it was the most beautiful invitation she has ever gotten

FH and I wanna do something special for SIL and BIL after the wedding for everything they have done for us..any ideas? We wanted to do more than dinner..