What happen when you hook up your fonction generator into the composite input of your cheap (I mean really cheap, I couldn’t believe it, I bought this for 8euros glorious euros !) old-but-goodie cathode ray TV? (of course you should limit the signal to 0.7V otherwise the TV will crap itself)
This was the result of a CD4093 triangle oscillator modulating the sweep input of the fonction generator.
Some images were very psychedelic, the only issue being that whithout proper sync it’s a terrible mess ! (but it was fun).