Aesthetically pleasing patterns evolve from a process of natural selection. The same process which is at work in various forms of genetic algorithms whether human based genetic algorithms (HBGAs) or interactive genetic algorithm (IGAs) the aesthetic quality is determined by the selector which in these examples must be human.
An obvious way to measure the attractiveness of various different candidate patterns is to use the process of selection. For example in a market based approach to selection the patterns could be product designs. How do we determine whether or not the product is successful or a failure? By the popularity of the product, and how often it is used.
In order for an attractor to be sticky a person has to not want to stop paying attention to it, not want to get rid of it, because it encourages psychological attachment to itself. For example the habit of checking email or Facebook are examples because both product patterns are sticky.
A pattern is sticky if people continue to pay attention to a particular pattern as a habit. This could be because the pattern fulfils some psychological need or it could be because the pattern meets a critical utility.
A token is only effective as an attractor if a lot of people want it. A lot of people will only want it if it's exchangeable for something a lot of people want. If it's exchangeable for something that a lot of people want a whole lot of then it's going to be extremely effective as an attractor token but it is still just only an attractor token.
The purpose of attractor tokens is to attract the swarm of attention. These attractor tokens and attractor patterns in general facilitate the process of stigmergy. Stigmergy is what actually coordinates and directs the swarm allowing for swarm intelligence to emerge.
References
Chang, J. F., & Shi, P. (2011). Using investment satisfaction capability index based particle swarm optimization to construct a stock portfolio. Information Sciences, 181(14), 2989-2999.
Miller, P. (2007). Swarm theory. National Geographic, 212(1), 1-17.