If you like cereals, then there are recipes out there that are as good or better than the premium juices like Looper, Cereal Killah, etc. I recommend this one:
(FA = Flavourart, FW = Flavor West, CAP = Capella, FE = Flavors Express)
It is a spot on Fruity COPYRIGHTDMCA in milk. As good as just about any premium cereal juice you can buy. All credit goes to "Jackster" on Reddit who created this. People actually copied this recipe and began selling it as their own creation, which ticked him off.
Basically if you're looking for sweet and cereal style vapes, here are some flavors I would definitely buy:
Meringue - FA (a must have. Period).
Hazelnut (FA or FW or TFA -- any are fine)
Sweet Cream - TFA
Bavarian Cream (or the DX diketone free version) from TFA
Yellow Cake - FW
Fresh Cream - FA
Vanilla Custard - CAP (the v2 is diketone free)
Vanilla Swirl - TFA
Fruits are subjective, but these are good staples:
Strawberry - TFA
Strawberry Ripe -TFA
Orange - FA
Bergamot - FA
Lemon Sicily - FA (a sweet bakery style lemon without the tart)
Lemon - FE (people seem to swear by this for an authentic lemon with the tart. I bought it just for the recipe I posted above).
Blueberry and raspberry are hard. I've never had one of either that I really liked.