Deppending on how many yours you've played (not afk) so it isn't given out effortlessy, the prizes should look somewhat like this:
1-2 hours - Poke Balls, Antidotes, Ice Heals, Great Balls
3-5 Hours - Ultra Balls, Stardusts, Pearls, Heart Scales, Deepseatooth/Scale, Premier Balls
6-7 hours - Big Pearls, Star Pieces, Nuggets, Soft Sands, Blue Shards, Mystic Waters
8-10 hours - Swimmear Pants (White), Yellow Shards, Red Shards, Blue Shards, Silk Scarves, Smoke Balls, Thick Clubs, Sticks, Everstones, Metal Coats
10-15 hours - Green Shards, Exp Shares, Leftovers
16+ hours - Lucky Egg (0,5% or so) [okno]
(these are just examples, im not saying it should be exactly like this)
just a additional reward for playing the game, and maybe this could be even better than implementing daily quests since they dont want us to log on just to do them