I thought it would be pretty cool if you get different things instead of champion/skins shards. For example, you could get an ARAM skin boost from the hextech box. No need to upgrade, just add a button in ARAM to choose whether you want to activate it if you have a shard of it. If you can give 3250rp skins, I think a 100rp skin boost wouldn't cause too much harm if you were to add it into the lottery.
any other ideas like this would be pretty cool.