Filling for rainbow cake

[BringOn2014]

I'm making a rainbow cake for DHs birthday tomorrow, did a practice run last week with 4 layers and it turned out well but I used buttercream inbetween all the layers and it was a bit too sweet.
DH doesnt like cream cheese frosting so what are the other options? I read about some icing with egg whites but is it difficult to do? Im not good at the technical stuff and I was wondering if it is actually much less sweet than the buttercream.
Or I was thinking about alternating jam and buttercream layers, would that work?
Any ideas greatly received

There is one that can be made with flour. Siunds grim but it it lovely. Ill see if I can link to it.

tastykitchen.com/blog/2010/03/a-tasty-recipe-thats-the-best-frosting-ive-ever-had/

The first time I tried it I used caster sugar and it wasnt that nice. Did it again with granulated sugar and a drop of pure vanilla and it was gorgeous. I'm not keen on overly sweet icing either.

Thanks Mike I'll definitely give it a shot. You definitely think to try it with granulated sugar though, wasnt it crunchy?

Surprisingly not!

I make cooked flour frosting all the time now - it's delicious. Not too sweet but really creamy and light, not cloying like icing sugar + butter. Granulated sugar really is the key, though. Something magic happens to it, obviously.

That looks lovely - could you tell me what you did measurement wise for the cup of butter and sugar? A teacup? Something bigger? Or do you have a weight in mind of butter and sugar?

Thank you so much Mike I have to admit I wasnt sure how it was going to turn out but it was perfect and definitely a new family favourite!

Thats great.

You need to try it with chocolate cake. It tastes even better.