Be charmed by the lovely Forget me not (Myosotis) as they make a generous carpet of blue in Spring and early Summer and need hardly any looking after. You simply strew the seed about in shady areas, they even like dry shade! and forgotten corners of you garden and the following year you can be delighted for weeks on end by the tiny but vibrant flowers. They also come in white and pink but I find these plants are not as robust as the blue.
The only maintenance I give them is to pull out the plants that have strayed (before they go to seed!) and at the end of the season I pull up plants that have passed their best but I leave them in the garden beds to compost or place them where I want colour next year. If you like a great filler plant that is airy enough to let light in for all the other things coming up in Spring I urge you to fling some forget me not seeds about. They are super in pots as well covering up bulbs that may be dying back until you can plant something else in them.
My most loved thing about forget me not flowers is how long they last in a vase or to use about the house in decorating projects on door wreaths and they are one of my favorite flowers for drying as they press well and the light blue last a long time which makes them perfect for strewing in potpourri.