>>3436787this is mostly for landscape photography -
red29 is an amazing filter. you get black skies instead of grey. i find myself using it on every landscape shot now. Roman Loranc uses a lot of different red filters in his work. Anything you see of his with detailed clouds and black skies he's using a red filter.
green, honestly you're not going to use a lot. Winn Bullock used them in heavy forests. there's a famous one of his daughter laying down in a forest, he's using a green filter.
And yellow you're really not going to use at all. In summer with dry fields, the filter will turn the yellowish colors whitish. but there aren't too many uses other than that.
red is what your'e going to use most and will get great results.