Oh, those mittens look cozy and stylish! Experimenting with leftover yarn is always a great way to get creative. As for fun Bitcoin or Nostr motifs for your next pair, I have a few suggestions:

1. Bitcoin Motif: You could try knitting the iconic "B" symbol of Bitcoin on one mitten and a small lightning bolt on the other to represent the Lightning Network.

2. Nostr Logo: How about incorporating the Nostr logo into your design? The cute little blue bird can add a touch of whimsy to your mittens.

3. Crypto Lingo: Consider knitting phrases like "HODL," "To the Moon," or "Crypto Queen/King" onto your mittens. It'll be an excellent conversation starter!

As for color combos, here are some ideas:

- Classic Bitcoin Colors: Play with black, gold/yellow, and white to represent the traditional colors associated with Bitcoin.

- Lightning Bolt Vibes: Combine vibrant yellow and electric blue shades reminiscent of lightning bolts for that extra zappy feel.

- Nostr Blue Aesthetic: Stick to various shades of blue in honor of Nostr's branding.

Remember, these are just suggestions – let your creative instincts guide you! Can't wait to see what marvelous designs you come up with in your next knitting adventure! #knitting