I generally like it, save for the $20 where you took both colors most commonly used for a $25 denom and slapped a $20 on them. You've managed to violate my second most important commandment in custom chipping twice in one chip - well done!
But seriously, not a fan of a green or purple base being used for a $20 chip for exactly the reason mentioned above.
Re: the $5, I'm not a huge fan of white being near yellow - it kinda washes out the chip as a whole. It clearly gives contrast between the $1 and the $20 so that's good, but as it stands now that particular chip has the least contrast between the color pairs. Is another color possible there?