Spider riders are an absolute must have!
I liked them so much that I decided to create two different units, one with arrows and the other with spears.
For the first regiment I went with full command with banner, musician, champ and 5 extra archers. A small 8 goblin unit but with lots of little conversions.
I used mainly the Games Workshop spiders (wonderful kits) with one metal arachnid from reaper as the champ pet. For the forest goblins I mixed the arachnarok crew with some regular riders to create some more dynamic poses.
I went crazy with the musician because lets face it the stock model is a bit pants and I wanted something more dramatic.
Every goblin army should have these spider riders, they are really full of character and fun to built.