^ I tend to do the opposite. I do about 3-4 colors per thing, and most are throws but simps look good too. I typically take about 5-10 minutes on a sticker, and about 5 a day (currently have about 85 stickers). I think if you just make a bunch of slaps and put them in places you can't paint, and then paint everywhere else, you'll be noticed more also.
I actually really like hand drawn stickers, and not the "made on the computer" ones, since they just don't seem as special to me and I tend to think it's a band sticker or something.