#34 nice graphics. How about adding a mirror image of the design element underneath the words and let's see the air flow (flower stems) in blue with the flowers only in purple.
#72 I like this design because it reminds me of a corner of a grate or grille so any thing you can do to make your design look more like a grate will help.
#158 I like your grate in this one better than #156 but I like your purple color and your scenting graphics better in #156. In 158 the scenting graphic looks a little like a flame. You're definitely on the right track. My partner will weigh in on his thoughts a little later. Nice fonts in both....Thanks for your efforts so far....good stuff!
#164 I would like to see this design without the plant above the last "s" and I think I might like the "scenting waves" to be all various shades of blue like the center wave in your design #147. Thank you for efforts.
Uta, would like to see some variations with your color schemes to combine one design with purples, violets, pink tones in the color wheel and one design combining blue green and yellow tones in the color wheel. I think mixing these color (green and purple) in the design is distracting since they aren't compatible colors. Would also like to see any idea around making the grate appear wholly or partially rectangular instead of oval....otherwise, you might make it appear to simply be a cutout of a larger grate so the shape is less specific. Since the entire grate is now perfectly oval, it doesn't really look like an air grate....appears to be more like a cooking grill. Thanks Uta.