A brief idea ...
 
Personally, I've found some of Jimmy's limited edition stamps and recent artwork pretty dull, both aesthetically and politically.  And all those ebay auctions going into hundreds of pounds from the Aquarium Gallery ... quite mad, imho.
 
So, what about something cheaper?  (Clears throat) The Milnese Stamp Distribution Service.  21p for second class, 30p for first (or indeed, any other monetary amount in any other country).  Real stamps are cheap.  All you need to do is buy some, and distribute them.  Easy.
 
Here are eight ways of Stamp Distribution.  There are probably others:
(1) "The Classic".  Buy the correct amount of postage for your envelope, put the stamp on, and mail it.  Repeat roughly two to three thousand times in a lifetime.
 
(2) "The Double Classic".  Buy the correct amount of postage ... twice.  Stick them both on the envelope.  Mail.
 
(3) "The Barman's Dozen".  Buy a book of twelve stamps from the post office (or shop).  Also buy a thirteenth stamp, and after paying for it, hand it back saying: "And have one yourself". 
 
(4) "The Postman's Score".  The same as above, but after buying twenty-one stamps.
 
(5) "Floor Sweepings".  Mostly a Post Office mode of distribution, leave a stamp (or some stamps, if you're feeling generous) on the counter, alongside the other discarded scraps of paper and pens that gather there over the day, so that someone else can pick them up.  Stamps can also be left on the floor of a shop or Post Office, but they are more difficult to pick up, and so may be inaccessible to the elderly or infirm.
 
(6) "Going Postal".  Can you leave stamps in the most inhospitable places on Earth?  In Britain, for example, can you leave a stamp on the counter of the Post Office in Baltasound, Shetland (the most northernly in the UK)?  Or alternatively, at Port Lockroy Post Office, Goudier Island, Antarctica? Take photographs of yourself distributing your stamps (here is the idea: http://www.antarctica.ac.uk/Living_and_Working/Diaries/Port_Lockroy/pete_poffice2.jpg), then using flippr or Google maps or whatever, you can trace your distribution exploits around the globe, and swap your information with friends.  Note: this may cost more than 30p.
 
(7) "Chain Mail".  Buy self-adhesive stamps and put them on your clothing.  Claim it's a new fashion - but really, you're distributing stamps slowly and methodically.  They will fall off like fish scales during the day, and by nightfall you will have distributed all your stamps randomly around your city, town, village or workplace.
 
(8) "Russian Dolls".  Buy some stamps.  Put them in an envelope.  Put the proper postage on this envelope (preferably using the "Double Classic").  Then buy some more stamps, and put your stamped envelope and these stamps into a second envelope.  Repeat the process of puting proper postage onto the envelope, then put this second envelope into a third envelope along with yet more stamps.  Using different sizes and paddings, you can probably fit ten to fifteen envelopes (and hundreds of stamps) inside one another in the manner of Russian Dolls.  Then post the whole package off to a political leader of your choice.  This can either be in support, or in protest - you decide.
 
So ... there you go.  Stamp Distribution.  The fun new hobby for all the family!  I can see the websites and blogs now!  So ... get Distributing!
 
John Milne
 
(President, Milnese Stamp Distribution Centre, Stevenston, Ayrshire, UK).  E-mail enquiries only.  No postal.