You can make good AE beers without steeping grains. The grains just freshen them up a little & can add color & some different flavor complexities. Check out midwests' crystal & specialty grains for what they say the particular grains contribute. It'll def give you some ideas. I took a dark lager recipe from a member & added German WL029 yeast,& german hops to the Czech ones he uses. I also added some German rauchmalt,so the two steeping grains he used had to be mashed with the rauchmalt. So far,it adds a grilled roastiness to the wort. It's one of those things where reading what a grain can contribute that make the little differences we love.
That's why I recommended reading up on the steeping grains flavor & color profiles to get more familiar with what they contribute.
I make some of my recipes with all extract & hops that are good. You just have to combine not only different extracts,but ones from different countries as well. Beer/ales from around the world mean different things to different nationalities. Darker,lighter maltier,hoppier,drier,sweeter. Caramelly,bready,toasty,roasty. Some of the newer extracts coming out can give you some really different characters if you use your imagination & study a little. I've been doing that from the beginning,& they just come to me.