DragonForge Designs has an interesting kickstarter under away.
These are sheets of sci-fi/high tech materials which you can add to your bases.
Plus some additional fun items such as this column.
There are also some base sets:
It seems like any game of 40k requires dozens of flyer/Knight bases these days, so here you go!
Speaking of Knights...
Here are the sheets and tubing which I mentioned earlier.
A link for you: