There is a form of Syringa vulgaris known as 'Dappled Dawn' or 'Acubifolia variegata' that has yellow splashes on its leaves. The link below has a picture of it, though not a very good one.

Karl

Here is a link that might be useful: 'Dappled Dawn'

I found an other Syringa reticulata... white and greeen.... the sun burn the externe part of the leaves....I didn't found the name...
hendy