Add actor designtime-only mesh/sprite

I have a custom actor that I place in the level but it has no mesh or anything so selecting it is sometimes really hard and it just looks like a white bulb. Instead, can’t I add my own custom image for it to display in the editor that always faces the editor-camera? I noticed that TriggerBoxes do that and I would like that too for my own custom actors:

I solved it using billboards.