This book is exactly what it says - a book of inspiration and tips. It doesn't contain detailed instructions or parts lists for the models shown, because, as it says, you may not have all the parts. Instead, it is about helping Lego enthusiats move on from simply faithfully building boxed models to devising their own (and playing with them - it's clear that Lego is to be played with, and emphasises that models therefore need to be sturdy!
The book has an introduction which goes over some of the basic concepts of Lego. If you've been using it for long, some of this might seem obvious, however to a beginner, or someone who has mainly assembled Lego sets, issues like scale or colour or the importnace of having bricks sorted before you start are worth going over.
There is then a series of themes - vehicles, town and country, space and so forth, ending with a section on making "real" things - either full size models or actual useful things (a CD rack, a desk tidy, a bookend). Each section introduces some particularly useful bricks for its own models, and then gives clear photographs of a range of models, with helpful techniques described. Finally, we are introduced to the designer of the the section's models and hear about when the started with lego, what inspires them - and what their top tips are.
Most of the models shown are fairly compact, which fits the overall level of the book, making it easy to see how they are made even without plans and giving maximum inspiration in the least space.
An ideal Christmas present to give, perhaps, alongside those Lego boxed sets to help ensure that once built, they won't just gather dusk but be recycled into new and exciting models.