An easy party-shoe DIY is to bling up your heels with some jewelry.
I have been sparkling up a pair of dance shoes for an upcoming burlesque number, and as always with burlesque more is more is more -there can never be too much bling and sparkle- so also in this case. Instead of gluing hundreds of crystals one by one I cut apart a couple of earrings and a bracelet. And added some swarowskis and pearls string too, once I was at it. (You may recall me saying I don't like crafting all that much as it is messy and the result not always perfect but sometimes I just don't have a choice. And glittery stuff like this can almost be fun.)
For a more subtle result, that does not look like a unicorn arrived and puked up a bucket of glitter or so, you can get a new fancy smanshy shoe by just attaching one earring, or parts of it, on the side, heel or toe. The best is to choose a light piece that looks more blingy than it is. I got some earrlings on sale from H&M. I use a special embellishment glue called Jewel It which is still elastic after it has hardened and also washable-proof.