I like building decks with cards that I have left over from drafts and Sealed events, and I'm always on the lookout for new ways to use cards that might not be effective in Standard decks, where you're always using four of each of the best cards, or Commander decks, where there's often a better option from an older set. So I have a lot of fun building decks for formats like Brawl, which give me opportunities to use a more diverse set of cards from Standard, and Tiny Leaders, which forces me to be creative by limiting the converted mana cost of the spells I can use.
So why not combine the restrictions of Brawl and Tiny Leaders and see what happens?