To start of the gardening season with color, incorporate in your design some of the following plants. Just be sure they are hardy for your zone.
Trees
Allegheny Serviceberry (Amelanchier laevis)
Bradford Pear (Pyrus calleryana)
Camelot Crabapple (Malus ‘Camzam’)
Eastern Redbuds (Cercis canadensis)
Flowering Dogwood (Cornus florida)
Higan Cherry (Prunus subhirtella)
Kwanzan Flowering Cherry (Prunus serrulata “Kwanzan”)
Little Leaf Linden (Tilia cordata)
Native American Plum (Prunus Americana)
Purple Leaf Sand Cherry (Prunus cistena)
Royalty Crabapple Tree (Malus ‘Royalty’)
Saucer Magnolia (Magnolia x soulangiana)
Star Magnolia (Magnolia stellata)
Sweetbay Magnolia (Magnolia virginiana)
Washington Hawthornes (Crataegus phaenopyrum)
Here in New England soils are quite acidic in part due to the pine and oak forests. When the leaves and needles of these trees break down the resulting organic matter raises the acidity of the soil. This post lists a few beautiful shrubs which are tolerant acidic soil.