There's nothing easier to throw on than a bright structured dress. Why not try replacing your jeans with one of these drop-waisted numbers? They're super wearable for day with a pair of easy flats. Or, throw on a pair of heels and some sparkly jewels and you're ready for a night out.
Yellow: Three Floor yellow drop waist dress ($165, Shopbop)
Red: Diane von Furstenberg Maeryn poplin drop-waist dress ($385, Saks) (also, a very similar red shift drop waist dress for just $84 at Topshop here)
Green: CÖ kelly green drop-waist tailored crepe dress ($70, Urban Outfitters)
If you like the drop waist look, but don't want to give up shape, I'd point you towards this Kate Spade number.
Kate Spade New York "Siren" hot pink ruffle hem sheath dress ($297, Zappos)