I have a full spectrum modified 6D that I use for astro and infrared work - loads of fun
Here's a few:
IR Church - 630nm IR filter + ND filter with blue/red channel swap
IR Lightning - 630nm IR filter no channel swapping
Windmill - as per IR church
Infrared Bridge Trees - 720nm IR filter on a stock 5D mark II with blue/red channel swap
IR Grass Trees - B+W 403 filter (bit like a 760nm IR filter, but also passes UV giving blue skies without channel swap)