Beautiful red D. spatulata. 
D. capensis "red leaf" x spatulata "Hartmeyer" by Hawken Carlton, on Flickr
D. schizandra by Hawken Carlton, on Flickr
D. spatulata "Beerwah, Property of Friend of Lowrie" by Hawken Carlton, on Flickr
D. macrantha by Hawken Carlton, on Flickr
D. tubaestylis by Hawken Carlton, on Flickr
D. porrecta by Hawken Carlton, on Flickr
D. aliciae x spatulata ('Tamlin' x "Royal Natl. Pk. Sydney") by Hawken Carlton, on Flickr
D. tubaestylis by Hawken Carlton, on Flickr
D. tubaestylis by Hawken Carlton, on Flickr
D. squamosa Laterite Form by Hawken Carlton, on Flickr
D. grantsaui by Hawken Carlton, on Flickr
D. cistiflora (orange?) by Hawken Carlton, on Flickr
D. cistiflora "cream flower" by Hawken Carlton, on Flickr
D. cistiflora "cream flower" by Hawken Carlton, on Flickr
D. schizandra by Hawken Carlton, on Flickr
D. cuneifolia "undulate" by Hawken Carlton, on Flickr
D. ultramafica by Hawken Carlton, on Flickr
D. gigantea by Hawken Carlton, on Flickr
D. squamosa Laterite Form by Hawken Carlton, on Flickr
D. squamosa Sand Form by Hawken Carlton, on Flickr
D. aff. lanata "Flying Fox Creek" by Hawken Carlton, on Flickr
D. aff. lanata "Flying Fox Creek" by Hawken Carlton, on Flickr
D. auriculata Clare Valley by Hawken Carlton, on Flickr
D. filiformis Nova Scotia by Hawken Carlton, on Flickr
D. petiolaris Queensland by Hawken Carlton, on Flickr
D. petiolaris Queensland by Hawken Carlton, on Flickr
D. aff. ordensis "NT" x "Very Wide Leaf, Kingston Rest" by Hawken Carlton, on Flickr
D. aff. ordensis "NT" x "Very Wide Leaf, Kingston Rest" by Hawken Carlton, on Flickr
D. darwinensis Berrimah, NT by Hawken Carlton, on Flickr
D. anglica "Kanaele Bog, HI" x filiformis "Nova Scotia" by Hawken Carlton, on Flickr
D. bequaertii by Hawken Carlton, on Flickr
D. bequaertii by Hawken Carlton, on Flickr
D. lienaris x spatulata by Hawken Carlton, on Flickr
D. lienaris x spatulata by Hawken Carlton, on Flickr
D. regia 'Big Easy' by Hawken Carlton, on Flickr
D. neocaledonica by Hawken Carlton, on Flickr
D. spiralis Itacambira by Hawken Carlton, on Flickr
D. gibsonii by Hawken Carlton, on Flickr
D. dilatatopetiolaris by Hawken Carlton, on Flickr
D. brevicornis Darwin River by Hawken Carlton, on Flickr
D. falconeri Palmerston x ordensis Lake Argyle by Hawken Carlton, on Flickr
D. rubrifolia Hex River S. A. by Hawken Carlton, on Flickr
D. ultramafica x spatulata 'Tamlin' by Hawken Carlton, on Flickr
D. Andromeda by Hawken Carlton, on Flickr
D. brevicornis by Hawken Carlton, on Flickr
D. brevicornis by Hawken Carlton, on Flickr
D. anglica "Germany" by Hawken Carlton, on Flickr
D. chrysolepis by Hawken Carlton, on FlickrI'm guessing that this would require the use of a plant mutagen like Colchicine?Just occurred to me: You could make your linearis x spatulata hexaploid then cross it with D. tokaiensis. The result would essentially be a hexaploid nagamotoi (anglica x spatulata). See what I mean? You could name it nagamotoi subsp. whatever.
D. capensis "Red, Gifberg" by Hawken Carlton, on Flickr
D. paleacea by Hawken Carlton, on Flickr
D. menziesii by Hawken Carlton, on Flickr
D. neocaledonia x oblanceolata "Sunset Peak" by Hawken Carlton, on Flickr