Had a bit of difficulty deciding on a strategy for the background. I did a ballpoint pen drawing and imported to Photoshop to create a psd file. Then I tried vectorising in Illustrator and even inking with the pen tool. I am not a huge fan of the perfect inked line the pen tool tends to create when you are inexperienced with it (as I am). Finally settled on this - isolated the line and now colouring in Manga Studio on a layer underneath.
I am enjoying the brush because it is giving me a mottled texture rather than super smooth saturated colour. Maybe not as good as the stock background provided by Manga Studio but more in keeping with the figure. I like the layout of the background better too as it gives it more depth. Works for me anyway.