I really like #21. The colors are bright, the logo is crisp. I like the use of the pause symbol. The font is good. I like use of both blue and green in symbol & words.
Entry #19 is good. The symbol is unique. I like that both blue and green are used in the symbol & words. I like the font - simple and clean. The symbol is like a flower, but also could be a seated figure with arms up and open. Two green vertical rectangles are similar to the pause symbol.