During 24 Days of Hackage last year, I wrote some basic code to get a spinning triangle on screen, using VBOs and shaders. You can find the code for this at
https://github.com/ocharles/blog/blob/master/code/2013-12-02-linear-example.hs.
To do texturing, it's not much more complicated. My toy "hadoom" project (a Doom-like engine in Haskell) uses texturing - but obviously there's more code to wade through there. I think the relevant stuff will be
You'll have to do some grep'ing to see how it all fits together. You'll also need to add UV coordinates to the triangle.
Hope this provides enough information to help you get started. If you're comfortable on IRC, you might want to swing by #haskell-game on Freenode, where we're trying to build a Haskell game/graphics dev community.
- ocharles