Here's my current take on Rose Dragons. Really in love with this archetype for not only the beautiful card art, but their versatility as well. Black Rose Dragon also being one of the most iconic of the Signer Dragons.
Not many long winded combos, but most of the better plays are as follows:
White Rose Cloister to special summon a rose dragon or one of your plant type monsters. If you summon a tuner: you can bring out Dark Rose Fairy as well.
Rose Girl can special summon herself if you have her in hand when using Lonefire Blossom's effect, or when using any of your plant type monsters to perform a Synchro or Link summon.
In addition, White Rose Dragon can special summon itself from hand by having any dragon or plant type tuner on the field.
Twilight Rose Knight's effect of special summoning a level 4 or below plant type monster from hand enables the classic level 7 combo for Black Rose Dragon, or level 6 for Splendid Rose/Queen of Thorns.
More to come on this since it's my first deck I'm posting, but the side deck is there mostly to play around with. Hope this is useful to someone :)