There are a lot of different tree species that have variegated cultivars.
Maples are a good start in variegation.
Beech trees and Lilac bushes also come with ornamental, variegated leaves.
Viburnum Clouds
I had noticed puffs of flowers coming from a Viburnum.
As if clouds are floating around this plant.
Gold Watch
There are many golden plants available these days.
Golden Hops suckers everywhere and grows fast, for good competition with grass below and the Giant Miscanthus it climbs on.
Golden Ninebark is a bright-leaved bush and as an added bonus, flowers, too.
A good contrast of colored Smoke trees(Cotinus).
Cottonwood Clouds
The largest tree on this Oasis is the Cottonwood(Populus deltoides) below:
Yet the tall clouds put the tree’s height in perspective.
Copper Red Ninebark
For interesting leaf color on a bush, the Copper Red Ninebark(Physocarpus opulifolius ‘Coppertina’) sure is noticeable.
I really like the contrast with the green grass.
Purple Robe Locust
Purple Robe Locust is a very beautiful tree in spring.
The main flower display is now, but these trees will intermittently flower throughout summer.
Royal Frost Birch Leaves
The Royal Frost Birch has leaves that first start out purple, but turn purplish-greenish as time goes on.
These Birch trees are said to be resistant to the devastating Bronze Birch Borer.
Golden Hoptree
The Golden Hoptree(Ptelea trifoliata ‘Aurea’) has leaves that nearly glow bright like the Sun.
This little tree is also commonly called a Wafer Ash.
Bristly Locust Flower
Bristly Locust(Robinia fertilis) has attractive pink flowers.
These shrubs spread via suckers, but also have viable seed.
Yellow Willow Catkins
The native Black Willow can be attractive with its many yellow catkins.
Black Willow(Salix nigra) doesn’t make a good landscape tree because the branches break easily like a Crack Willow(Salix fragilis).