Time to work on a custom set
I did, but I'd eventually like to redo them. It's a time consuming process and I haven't had the opportunity yet. I tried to buy the icon set from the guy who made Metagrid, but he wouldn't sell me a license to use the icons. You could just buy the app and then pull the icons off of a screen grab in Photoshop, if you have an iOS device (I don't).