I feed the same as illusive..no color added or preservatives.
Myspiceage is an awesome place for herbs n spices and dehydrated veggies. Not just for the birds but for us too. Their spices are sooo much fresher than ones bought at the grocery store. mmmmm
Levi and Ziggy both LOVE the dehydrated red bell peppers from that site, and also the dehydrated carrots. It seems the larger the quantity you buy, the bigger the pieces, so some might have to be chopped a bit.
Oh and the crushed red pepper is another big time fav. mmmmm good!LOL
The thing about dehydrated veggies is that they are just as nutritious as fresh veggies. Better even than frozen. And you can mix them in ti their seed mix

Fresh is certainly good/GREAT too and mine love them too, but adding dehydrated keeps the worry out of having to provide fresh and wash n slice n dice all the time. Niiice when you are busy!
One thing I might add when considering making your own,or adding to the mix you get...both hemp and flax are oily seeds and high in protein. They are both SUPER nutritious tho and very good for our birds. They just should not make up much of the overall mix. Use sparingly. Hemp seeds are virtual little powerhouses of nutrition-for birds AND humans!
Ditto on the eggfood mix illusive linked at the birdsupplynh, it's great stuff for molting periods.
The Petamine can usually be found at petstores if you prefer not buying online.