Like Peanutbutter I use frozen mixed veg as a base then add other fresh foods. Millet spray as a treat. My guys are on small parrot seed with pellets added to the fresh mix. Leafy greens seem to be a favourite (I use celery leaves, baby spinach, asian greens whatever is in the fridge at the time). Soaked mix or sprouted mix (depending on how slack I am with the sprouting) is also added to the fresh.
I've been lucky and my guys do all seem to be fruit and veg eaters, however, as people who have bought babies from me have found out, it has to be a particular brand of frozen or they won't touch it.