This worksheet is designed for pair work (but can be changed to one on one or a bonus if needed). The first sentences have students combining two different sentences with appossitives. The last few have students taking sentences with relative clauses and re-wiritng them to contain appositives.
Students tend to like the worksheet more than the one from the books as it is a bit more interesting (involves Lady Gaga, unicorn vomit, etc.)
Examples of answers are on the second page, but as with most English writing assignments there are many possibilities.