If you install the Spitfire Audio app, it instantly gives you access to their LABS series of VST instruments. They release new ones every month, and they're weird and eclectic and a great way to inspire your muse. There's everything from a lap steel guitar to whalesong, from the atmos of London tube stations to characterful cellos. The latest one dropped last night. It's a sampled Solina String Machine (the real thing was used by Tangerine Dream, Pink Floyd and New Order, to name a few), and full of swirly goodness:
Click on their "Or free" banner here, fill out a very simple and non-intrusive questionnaire, wait for two weeks, and the Spitfire Audio app will also install their BBC Symphony Orchestra "Discover" package for free. It's a brilliantly designed piece of software and if you've ever wondered what it would be like to arrange music for a full orchestra, this will start you on the road to finding out.