In the same way you might mend a green or yellow lampshade - generally the colo(u)r of the shade makes little difference.
More important is the specific problem with the lampshade - that will determine the approach.
Elmers is a brand name for an adhesive company their web site has a glue guide...
http://www.elmers.com/homerepair/glueguide.asp
Peccavi, June 2009
