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I suggest that you initially look at Style pack Vols 36 & 37 which are the latest ones, but since I no longer have my 700 I cannot look for you and give specifics. I am not even sure if the Freeplay styles are in the Bonusware Style packs, if you also ask on Korgforums someone there will be able to advise in specific detail.
The Freeplay Styles were included in the Pa4X upgrade and a limited number were supposedly going to find there way into Styles for the 1000 & 700, in Korg's own time these may or may not happen in more quantity.
Do take care installing the Style packsd as they may well default to being loaded into User Bank 1 position 1 and loading the Style packs to audition them is the only way to find specific Styles you want, I suggest that once you have loaded the Style pack you copy and paste any required Styles to a high User Bank then delete the unwanted Styles and then load another Style pack and repeat the auditioning and copy and pasting process.
You can also load Osimo if you do not know how to do this then please look in the Korg section where there is a post of mine giving chapter and verse on how to do this.