My wife and I got married in Nov. and were going to do a robot heroes G1 Jazz and Mini My Little Pony figure slightly repainted in our colors, but we ran out of time to get them painted between all the job switching and moving, then decided that paint didn't matter, then forgot to take them to the wedding with us. Doh! But I did get Masterpiece Starscream as a wedding gift!
Take a look at the Robot Heroes soundwave, I think that one would be hillarious in a tux. Painting a "jacket" on him wouldn't be too hard, and a piece of ribbon done as a bowtie and voila! For the wonder woman I'd suggest finding a traditional topper with long black hair that fits the Soundwave (whichever you use)scale and make the classic wonder woman tiara out of sculpey or something, and give her a real fabric lasso of truth. (and maybe enhance that certain area that makes her "wonder-bra" woman if it needs it : p)