Hi Judit! Your idiom is very interesting because of that omelette! :) We have same kind of idiom in Finland: " Taivaanrannanmaalari". It means that some person is painting to the sky. Typically "taivaanrannanmaalari"-person sounds not like a realist and his thinkings so positive that they sound like a dream.

My idiom is "more you do, more happens". "Tekevälle sattuu" in finnish.

It means that someone who does many things does more likely also mistakes. I think it is still much better to do things than doing nothing. When you try to do things right, don´t be afraid of mistakes!

http://www.tuuliadesign.fi/@Bin/179842/Tekevälle%20sattuu_web.jpeg