WOW, tht wud be smthng to remember for him. Not sure as wt exactly u have in ur mind for d gift. However, if are looking for flowers then you can go through the following links

http://www.interflora.co.uk/
http://www.jennyflowers.com/
http://flowersnfloristsindia.com/flowers_Qatar_flowers.asp
http://dohaflorist.com/

I hope you wud be knowing his Company or Home address...hehe