I've just managed to get BruControl working and am looking in the future to add a custom graphic behind all the in/out and data.
Please show me your designs so I can steal some ideas!
Thanks! I think someone recommended it in the brucontrol thread:
https://www.lucidchart.com/
I'm far from being artistically gifted, but this program was really easy to use. I think the free version has limited objects, so once I hit that limit I just signed up for the free trial and finished my work.