This [incomplete and ongoing] list of works organized by instrumentation [and/or ensemble size/type] will hopefully serve as a resource for performers, composers and researchers alike. Each composition's author links back to their page, where you can find more information.
Laur [for flute, bass clarinet, bassoon, horn, trumpet, trombone, percussion, piano, 2 violins, viola, cello, and double bass]  :  Guðmundur Steinn Gunnarsson
Harskjall og svellkar [for flute choir (8/4/2)]  :  Guðmundur Steinn Gunnarsson
Handarbaka [for 8 bassoons]  :  Guðmundur Steinn Gunnarsson
Þrílækja [for 3 percussionists, 2 alto saxophones, 1 tenor saxophone, 2 violins and 1 viola]  :  Guðmundur Steinn Gunnarsson
Sculpture #2 [for 8 performers (4 in 2 groups)]  :  Þráinn Hjálmarsson
Bok [for 8 bassoons and 2 contrabassoons]  :  Þráinn Hjálmarsson
Hand of Clod [for 2 vocalists, string trio, and 2 turntablists]  :  Andy Ingamells
Mynes [for 7 bassoons]  :  Páll Ivan Pálsson
Study no. 12 [windmills] [for bottle blowers]  :  Ryan Ross Smith
Study no. 28.1 [5x1:5x3] [for 5 vocalists and 5 percussionists]  :  Ryan Ross Smith
Study no. 31.3 [for 12 (strings and winds)]  :  Ryan Ross Smith
lohanimalia [for bassoon, cello, thranophone, 2 double basses, electric guitar and percussion]  :  Bergrún Snæbjörnsdóttir