A long time ago, I had thought about designing toy soldiers, but gave up.
I used to spend a lot of time modifying figures, changing weapons, adding new hats, cloaks, etc. It was fun.
With the impending games of D&D, I decided to sort out a figure for my character. He is a Dwarf how has forgotten that he is a Dwarf - he just thinks he is a short human with very vigorous beard growth. He wears a floppy hat and uses a rapier - in the style of the 3 Musketeers.
I found an old figure, removed his horned helmet and gave him a new hat and rapier (a pin).
I really enjoyed doing it. OK it isn't a masterpiece of conversion, but it should look great when it is painted.