Correct me if wrong, but I think the Robinia is available in green and yellow - the latter is stunning. Never seen the flowers, but the branches/stems are peculiar as they have thorns.
Thorns.....Quote RHS....."Robinia are vigorous suckering trees and shrubs, sometimes thorny, with pinnate leaves and racemes of pea-type flowers in early summer, sometimes followed by seed pods"
There is one that has pink flowers...Robinia pseudoacacia Hillieri.
Posts
Robinia pseudoacacia.
https://en.wikipedia.org/wiki/Robinia_pseudoacacia
Thorns.....Quote RHS....."Robinia are vigorous suckering trees and shrubs, sometimes thorny, with pinnate leaves and racemes of pea-type flowers in early summer, sometimes followed by seed pods"
There is one that has pink flowers...Robinia pseudoacacia Hillieri.
.https://www.google.com/search?client=firefox-b&biw=1920&bih=943&tbm=isch&sa=1&ei=yacVW8mIJoXIwAK62y8&q=robinia+pseudoacacia+hillieri&oq=Robinia+Pseudoacacia+hill&gs_l=img.1.1.0l2.9552.10890.0.14092.5.4.0.1.1.0.113.390.2j2.4.0....0...1c..64.img..0.5.394...0i67k1j0i30k1j0i24k1.0.pC9wLfnaiIw
There is a Robinia pseudoacacia Frisia which has golden leaves, with white flowers.
https://www.google.co.uk/search?q=Robinia+Pseudoacacia+Frisia&rlz=1C1CHBF_enGB785GB785&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjhlKzG87rbAhXpI8AKHZZLCLYQ_AUICigB&biw=1920&bih=949