Yogurt 1.5%
Black Cherry 2%
vanilla tahity 1%
vienna 2%
fresh cream 1%
The vanilla I mentioned is a bit sweet Its one of my favorites , try it without first and adjust accordingly.
edit: forgot to mention "fresh cream" is just what it says , just fresh cream, no sweetness to it.
edit2: If you dont have a sweetner and want sweetness, marshmallow at 1% would add some and perhaps even play well with the yogurt.... I would start with the 2 main ingredients and slowly add more if there is a demand making it "better" ... sometimes simple stuff comes out just the way some one would like it... e.g my friends less like my complex diy stuff but really love the 2-3 ingredient simple stuff (usually fruits or baccos)