I think these ones might look very tidy - there ia a choice of colours (Red, Light Blue, Dark Blue, Gold, Purple, Green, etc).
http://www.ebay.co.uk/itm/FAIRING-BODYWORK-alloy-Dark-Blue-washers-gold-M6-bolt-streetfighter-trike-/251048088629?pt=UK_Motorcycle_Parts&hash=item3a73a1d435" onclick="window.open(this.href);return false;
Downside: They aren’t super cheap, but at £9 inc p&p they aren’t terribly expensive either BUT there are only 8 in a set!!!!!!!
They are also 20mm, so you may have to shorten some of them - not sure of the longest bolt the blind holes will take but suspect it will be less than 20mm.
For the more budget conscious and far less flash, there are these:
http://www.ebay.co.uk/itm/110905126998?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649" onclick="window.open(this.href);return false;
They are zinc plated steel, standard M6 x 1mm pitch and he has them in 16mm & 20mm lengths.
Then there are these, which again are very nice but the cost adds up:
http://www.pro-bolt.com/index.php/stainless-steel-dome-head-bolt-m6-x-1-00mm-x-16mm.html#.T_BoXZHhe4U" onclick="window.open(this.href);return false;
Or finally, a whole selection of colours and not too expensive (not sure about postage though):
http://www.pro-bolt.com/index.php/aluminium/aluminium-bolts-dome-head.html?length=191&qty_in_pack=190&thread_washer_dia=431" onclick="window.open(this.href);return false;
I haven't made my mind up yet what to go for - what do you reckon guys?