Wotan's Krieger has done some excellent work continuing with the study of the Blitzbundle symbol on his Armanenschaft blog here. Wotan's Krieger mentions the works of Walther Blachetta and his book 'Das Buch der Deutschen Sinnzeichen'. This book will be of interest to anyone studying Germanic symbolism - an on line copy (in German) can be found here.
Blachetta (born 10th May 1891) was a lecturer on folklore and folk song, edited numerous magazines and papers, studied runelore and authored many books, including books on the runes, the Midsommer and Winter solstice holidays and was a high ranking member of the SS. No doubt much of his work will be appearing on this blog sometime in the future!