Someone told me that these can come in some tangible form - in small quantities, or am I mistaken?
There's
CASASCIUS bitcoins (digital bitcoins with the keys printed on physical coins thus bringing the abstract 'coin' into real space), and you can even print up specially designed 'bitbills' or banknote-style artistic paper wallets yourself as a DIY job - there was a competition in these forums and the winning design is rather good (IMO).