Wow! That looks great. You are right, if you have a physical bitcoin then you will be able to make more people attract towards bitcoin because it looks really cool and everyone would love to have it.
Well i guess there is still a long time for me to have one like that in my hands

Mitchell has an awesome collection, a good place to go and salivate.

I have a few of bigtimespaghetti's coins - the silver goxxed coins and an Unobtanium bar. Also have a few novelty bitcoins.

While these aren't exactly coins, I love having these in my collection: https://bt.irlbtc.com/view/852488.0 (Bitcoin certificates).

Well then it isn't really worth much. There are a lot of coins that are much more expensive than that (I think my Kialara was about $100). Take a look at the newer ones.

I offer 0.1 BTC for everything that you own.  

Unfortunately, not. I still dont have any of those cool physical bitcoins, but i am planning to buy at least one Casascius silver 0.1BTC coin these days.

I've never researched into physical bitcoins purely because I've had no need to & couldn't be bothered.

Couldn't you get your private key & bitcoin address engraved on the coin though, effectively then it would obviously have value as you could send bitcoins to it/them.

Is that what a Casascius Coin does

They don't need to do that to have value. You need to consider two things: 1. They are collectibles; 2. They are usually made out of pure silver/gold (sometimes graded). They will always have value which is most likely going to increase over time. There are some coins that have an address and private key in them, albeit they are art pieces (Kialara; you kind of need to break it to get to the private key). There are also coins such as the Silver Wallet, that come with a coin slab in which you can easily add a new address (with QR code) and a private key.

There can't be a "official" form of physical Bitcoins. Bitcoin does not have a central authority; who would proclaim it the 'official'?

You can buy various ones on the forum.

No I don't have any physical bitcoins.
Bitcoin is pure digital therefore I also explain it to people this way if they are interested.
Very often you see news articles where metal coins are used to give Bitcoin a face.This is ok but still confusing new interested people in the beginning.

I would like to get some made of copper or silver.  Do you consider a paper wallet physical Bitcoins?