User blog comment:DancerUnmixed/Does anyone know how to make picto sprites?/@comment-29512888-20181231141613

If you want to make a Mashup, then crop the pictograms you need in 256x256 pictures and put them together. If you're doing this on paint.net, click on Image > Canvas size > write "256x256" > Anchor on the Left.

If you want to make your own pictograms, then... I don't know, sorry :/