Do all Buddhists abstain from alcohol? I've been to a nice restaurant (pictured below) where the bar was decorated with statues of the Buddha. Given the 5th precept and all; this seemed a bit odd. Would it be correct to surmise that the 5th precept is understood in different ways among Buddhists?
In Tibetan Vajrayana Buddhism, the 5th precept is interpreted mostly as 'do not get intoxicated by alcohol and drugs' for non-ordained practitioners, meaning that it's up to you to know how much you can drink without affecting your mind. Ordained monks are still supposed to take the literal interpretation of the 5th precept and fully abstain from alcohol and mind-intoxicating drugs (except on the bi-weekly purification ceremony known as Tsog).

Of course, many people really don't know exactly how much they can consume until their minds get affected. That's why the more literal interpretation of the 5th precept is recommended: put it simply, if you don't know how your mind gets affected by alcohol/drugs, then abstain from it.

Also note that the whole point of the 5th precept is not to impose any kind of 'puritan morality'. It's just because if your goal of becoming a Buddhist practitioner is to train your mind, it's a bit pointless to consume anything that makes you less aware, less mindful, and pay less attention. Morality is not the point here!

As for the 'right' or 'wrong' way of using Buddha statues as decoration, that's a really tough question. If the bar owners are beginning practitioners, I would say that they should take their refuge vows a bit more seriously and refrain from using representations of the Buddhas as 'decoration'. If they are enlightened beings, then I would say this would be just a very clever trick to get people interested in Buddhism: by looking at the statue of a Buddha, someone without any connection with Buddhism might ask what the statue is about and get interested in the Buddhadharma — so forging a connection with the Dharma that way. They whole point of having representations of the Buddha all over the place is not to remind existing practitioners, but to get non-practitioners interested in asking more questions about it and eventually developing an interest in the Dharma :) But, to be very honest, I would be wary of using that argument to place Buddha statues in a bar...

If the bar owners are not practitioners at all, then, well, I'd say the same applies. Somehow they made a connection with the Dharma — somehow the Buddha statue appealed to them. And somehow this very weak connection with the Dharma will endure — if not in this life, then in the next. So I'd be happy to see that someone who is not a Buddhist at all to pick, among millions of different choices, a statue of the Buddha as a worthwhile 'decoration'. There will be some benefit to them :)