Well, aside from the obvious of substituting gluten free flour for wheat, you could do:
Rice dishes such as risotto (simple flavours like peas and mushrooms), rice pudding, rice salad, rice balls filled with stiff made hummus and deep fried, fried rice with peas and other chinese veg/flavours
Potato dishes like potato cakes, pan haggerty, bubble and squeak, jackets filled with yummy fillings, mash, potato topped pies like cottage ect, roasties.
Quinoa for the more adventurous! In salads and with pasta sauces
Roast veg stuffed with rice or quinoa
Bean and lentil dishes such as dips (blend with garlic, oil and salt), hummous, baked beans homemade with added veg and fresh toms and some spices, dahl, lentil soup with rice cakes
Cakes made with GF flour
Salads of fruit or veg
And these are all vegan too...