I went from coffee to green tea to barley and kukicha and now I just drink water and have a hot cup of miso soup in the am. It's so simple. My head is clear and I feel great. Not the advice you were looking for. Just wanted to share :)
check to see if you have a local tea shop (or somewhere that sells loose leaf tea) and literally sniff around. there are so many different types of teas out there i'd be genuinely surprised if you didn't find something you like. if you have a coffee shop, they should have herbal teas and such there (skip starbuck obviously, but check for a mom and pop - the one i used to work at had loose leaf tea, which tastes better in general). also, remember that decaf coffee does not exist naturally. it is chemically stripped. so while katerina is right that it isn't the end of the world, it also isn't a great substitute.
personally; i have found i like teas with orange, mint raspberry tea, and oolongs best.
About coffee; I was looking for something simular also... not only in taste but also in ritual. I found LIMA Yannoh filter coffee. It is made of barley and other. Important for me is that I do exactly the same things as with coffee, boil water, put Lima Yannoh in a filter and make coffee. I boil the plantmilk ofcouse and make a "cappuccino" .
It really does give me the same feeling as coffee used too :) So happy because I dont know if I could have stopped the coffee without it....
I love Inka. It is available at most health food stores. I put a spoon in hot water and add Vanilla Silk Creamer. Talk about heaven! I have not wanted coffee since and it's so healthy, made of Barley. I wasn't sure the first time I tried it because it was not coffee and I was skepticle, but the second time I tried it, I was hooked for life. I hope you get a chance to try it. I also love Oregon Chai hot and whipped with my Braun. Half soy milk, half chai. They sell the liquid in a soy milk type carton. Trader Joes usually has the best price. It's really good, but a bit rich so I only have it on weekends. The Inka can easily be drank every day. It's light and lovely. I hope this helps! Eileen