They are probably not ugly. Just not your style. Lots of fabrics that are replicating 70s stuff is ugly to me, but lots of other folks love them.
Three choices - give them away or cut up into a larger scrap quilt. You are under no obligation to use them all at the same time. Third choice - use as backing for wall quilts.
My latest scrap quilt has the rest of the 'alien snot' that I received as part of an uglies swap. Since everybody in my family knew about the alien snot fabric, they go out of their way to look for it in various scrap quilts (it really was ugly).