I'm not crazy about making grass and weeds pink (and all these other colors) but I got started with this theme for my rainbow calendar and just keep on going! We have nothing blooming around here yet. I should make a rainbow calendar in April when my photos can be of colorful flowers and plants without all this ETSOOI. I'm still hoping it stops snowing and our flowers have a chance to bloom this month.
I have the same issues but I've handled it by making most of my calendar up with images taken previously and just reprocessed recently. We can only do what we can. Your coloured grasses do look intriguing though.