If you are just looking to have simple graphics or banners made for your groups or posts. I offer this service as part of my virtual assistant services and by itself for $10 each. If looking to have more than five made contact me with your budget and needs.
I make all the graphics you see in my posts on here and on my social media (have other examples available). I do not claim to be a graphic designer, but do enjoy doing making simple graphics and banners.