I had a quilt made (cot size) and my beautiful friend did the bulk of the work, then I paid for one of her friends to do the actual quilting - $100 just for that, so you could be looking at a big expense for something that may not look all that nice (LOL I know if I decorated quilt panel it wouldn't look too crash hot!).

Is there something else you could all decorate - letters of the alphabet and 1-10 or something like that? Might be a bit less effort and $$.

Have a lovely shower!

PS I think the singlet thing is lovely. You could also get some plain 1sies and hats. People could sew on buttons and lace. When I did it at a friend's not everyone made one anyway.