I have this in the rescue club, but it's sorta a hack too so I wanted to share here too: I dyed a Vernis Thompson black and bought an off-brand vachetta extender to make it a crossbody. I tried dying the inside red, but the dye would not stick to it for some reason so I went over in black and that didn't go well either, but it's still smooth so I do not mind. I ended up dying the straps black too because it was impossible not to get dye on them, I think I like the black better then the vachetta color straps.
I'm really happy with the outcome.
Here is a before photo (not the actual bag, forgot to take befores

but it's the same color of the one I did dye):
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Looks like a brand new bag. Great job!
Here's after the dye job:
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